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(NO Model.) a sheetssheet 1.

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- DYNAMO.

No. 380,702'.v Patented Apr. 10, 1888.

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3 Sheets-Sheet 2.

DYNAMO.

(No Model.)

No. 380,702. Patented Apr. 10, 1888.Y

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' PatentedApr. 10,1888.

"fld i 880W UNITED STATES PATENT OFFICE.

HENRY B. SLATER, OF DETROIT, MICHIGAN, ASSIGNOR TO THE DETROIT MOTORCOMPANY, OF SAME P LAOE.

DYNAMO.

SPECIFICATION forming part of Letters Patent No. 380,'2'02l dated Aprill0, 1888.

Application filed December 29, 1886. Serial No. 222.807. (No model.)

To all wiz/m) it may concern.-

Beit known that I, HENRY B'. SLATER, of Detroit, county of Wayne, Stateof Michigan, have invented a new and useful Improvement in Dynamos; andI declare the followingto be a full, clear, and exact description of thesame, such as will enable others skilled in the art to which it pertainsto make and use it, reference being had to the accompanying drawings,which form a part of this specification.

My invention consists of the combinations of devices and applianceshereinafter specified, and more particularly pointed out in the claims.In the drawings, Figure l represents a central section by a vertical.plane parallel with the shaft of a machine embodying my invention. Fig.2 is a sectional View at right angles to the shaft. Fig. 3 is a planview. Fig. 4 is a horizontal section through the shaft.

I desire it to be understood that in the use of the termdynamo-machines7 in this specification and claims it applies either tothe dynamo when constructed as a generator or when constructed as amotor.

It is the purpose of my invention to produce a dynamo in which, insteadof causing the helices of the armature to move past vthe pole piece orpieces which concentrate their infiuence at only one or two adjacentpoints upon each convolution as it passes by, the ieldmagnets are soarranged and their polepieces so adjusted that substantially the sameinfluence is exerted at different points distributed throughout thewhole length of cach convolution.

Another feature of my invention consists inl tributed at thecorresponding points throughexterior polepiece by bolting` or, otherwisefastening them together, and so shaped with said contiguous pole-piecethat they shall conform substantially to and closely embrace theexterior surfaces of the helices upon the armature.

In carrying out my invention, A is the shaft; B, any suitable supportsfor the shaft; C, any suitable commutator. y

I have not illustrated any particular form of 6o commutator, nor anyparticular form of construction whereby the bobbins or helices of thearmature are connected with the commut-ator, for it will be understoodthat this invention is equally applicable to any ordinary constructionof armature and commutator, and that any particular construction, so faras relates to the commutator or the winding of the armature, forms nopart of the invention described and covered by this patent.

D is the armature.

E represents four field-magnets terminating -in pole-pieces F upon theoutside of the armature-ring.

G represents two eld-magnets inside the armaturering and terminating inpole-pieces H. Directlyoppositethelatter,upontheotl1er side of thearmature,are two similar field-magnets, G', terminating in pole-piecesH. The pole-pieces H and H are connected directly with the pole-pieces Fby bolts or otherwise. They are so shaped adjacent to the helices orbobbins of the armature as to conform closely in shape thereto and so asclosely to envelop the latter, thus constituting in effect a singlepole-piece consisting of the parts F H H.

It is apparent, however, that by the arrangement of the field-magnets asabove described the poles or centers of excitement are dis-` o outnearly the whole length of each convolu- 9 tion of wire upon thearmature, so that instead of concentrating the action of thefield-magnets at one or two points opposite each convolution, as isquite customary in the construction 9 5 of dynamos, the action isdistributed by means of the several held-magnets with substantiallyequal effect at several points on each convolution.

I am aware that it is not new to construct 10o 1\ I W Y the pole-piecesof a field-magnet so that it shall substantially surround the bobbins orhelices ofthe armature; but in such cases thereis but a single pole orexcited center, and the exciting action is distributed about thiscenter, and rapidly decreases as one recedes from the pole or center, sothat while the action is intense at one point it is comparatively slightat the remote points of the pole-piece. So, also, I am aware that it isnot new to locate a pole-piece within the armature-ring and to excitethe same by independent field-magnets and with the interior pole-piecesconnected with the exterior by plates; but in such construction thepole-pieces have not been made to conform closely with the exterior'surface of the bobbins or helices of the armature, nor have they beenbrought in upon opposite sides of the armature, so as to produce severalpoles or centers of excitement distributed substantially throughout theent-ire length of the convolutions upon the bobbins or helices of thearmature; and so, while the last construction named accomplishes in somedegree abeneticial effect, the construction is notsuch in the devicewhich I have described as to effect in a complete and satisfactorymanner the purpose sought.

The armature D is in the form of a broad flat ring, so as to present adeep recess on the interior of the ring and upon each side of thespokes, so that the fieldmagnets G G may be brought well into theinterior of thearmaturering. rIheir polepieces, while being kept closetothe extremities of the helices of the said well in close to the planeof the spokes.

I would have it understood that when the interior and exteriorfield-magnets are all parallel to each other they may be either parallelwith the shaft or perpendicular thereto. I prefer, however, the latterconstruction.

It will be observed that in the construction illustrated in the drawingsthe Iieldmagnets are all arranged parallel with each other and in adirection perpendicular to the axis ofthe armature. This construction Ibelieve to be economical and beneficial, sinccit brings into activeoperation directly upon the bobbins of the armature the opposite ends ofthe core of each field-magnet.

In a generator constructed according to my invention I believe that agiven current can be produced with a smaller expenditure of power thanby other forms of dynamos, and as a motor I believe it will deliver agreater percentage of the power required to drive a primary generator.

l. In a dynamo-machine, the combination, with an armature wound so as topresent deep recesses upon both sides of the plane of its spokes, offield-magnets provided with polepieces arranged opposite the peripheryof the armature-ring, outside of the latter, and independentfield-magnets parallel to the former, provided with pole-pieces arrangedopposite the periphery ofthe armature-ring, but inside the same, saidinterior pole-pieces connected with the adjacent exterior pole-pieces,substantially as and for the purposes described.

2. In a dynamo-machine, the combination, with an armature wound so as topresent deep recesses upon both sides of the plane of its spokes, offield-magnets arranged at right angles to the shaft, and provided withpolepieces located opposite the periphery of the armature-ring andoutside the same, and in connection therewith independent held-magnetsparallel with the former, having` pole-pieces located opposite theperiphery of the armaturering, but within the same, and a correspondingset of independent field-magnets and polepieees located within the ring`on the opposite side of the plane of its spokes, the pole-pieces of saidinterior magnets connected with the adjacent polepicces of the exteriorheld-inagnets, substantially as and for the purposes described.

3. In a dynamo-machine, the combination, with an armature wound so as topresent deep recesses on both sides ofthe plaire` of its spokes, of fourield'magnets arranged at right angles to the shaft, provided with commonpole-pieces located opposite the periphery oi" the armatureriug, outsideof the same, and in connection therewith two independent hield-magnetsparallel with the former, provided with com mon polepieces opposite theperiphery ofthe armature-ring and within the saine, and upon theopposite side of the plane of the spokes two other independentfield-magnets parallel with the former, with common pole piecessimilarly arranged, said interior pole-pieces connected with theadjacent exterior polepieces, substantially as and tor the purposesdescribed.

In testimony whereof I sign this specification in the presence of twowitnesses.

HENRY B. SLATER.

Vitnesses:

N. S. VRIGH'r, JOHN E. Winns.

IOC

